Suppose my select query has cost 100 and I have another way in which i am writing two queries which has cost (40 + 60). Both have same cost ultimately.
I want to know what is the most effective way.
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Suppose my select query has cost 100 and I have another way in which i am writing two queries which has cost (40 + 60). Both have same cost ultimately.
I want to know what is the most effective way.
ignore cost. its not the starting place for tuning, its just an internal ranking used by Oracle to pick the best plan for a given SQL statement. Cost can never be used to compare two different SQL statements to determine which one is better; i.e you can have a query with very high cost that is faster and uses less resources than a query that has a low cost.
if the query is as fast as splitting it in two, then leave it as one SQL (1 less round trip to do).